What is ROM and what is it for, how does it work and what types are there?

rom memory operation

If you have no idea what ROM is for, don’t worry, that’s what I’m here for. Through this section I will explain about the ROM memory.

And it is that when talking about electronic components such as mobile phones, computers, among others, we forget the importance of ROM memory.

ROM is so important that takes care of starting the operating system of our device, be it any of the versions of the existing Microsoft Windows operating system, Apple, Android or any type of device that uses a similar system.

So I invite you to continue reading this wonderful section, so that you can learn what ROM memory is for, its function and much more.

What is it for?

When you talk about ROM in computer science, you refers to a storage type of mobiles, computers and other electronic devices, which is responsible for reading access. Hence the premise Read-only ROM memory: what is it and what is it for? How does it work and what types are there?

This means that it can host information, the user can retrieve it, but cannot intervene or modify its content.

This device is of vital importance, the ROM memory used to start the operating system on electronic devices.

When you press the start button of your electronic device, the ROM allows the initial program to start correctly, and then to start the system.

Data is stored in ROM. As the ROM system does not allow data to be modified, it is used to save some data.

what is rom memory for

Generally, manufacturers save logical and mathematical operations, technical product information, look-up tables, among others.

It is also used for store product software. In the 1980s, companies that made computers stored software in ROM so that people couldn’t access it.

In such a way that they could not make modifications or alterations that could interrupt the use of any feature, or completely damage the device.

Currently, ROM memory is used to save boot operating systems, or some other basic function, for example, the Setup, the BIOS, the Post, I enter others.

ROM types and their function

In turn, it should be clear what the difference is between RAM and ROM and what types exist between the two, in order to avoid confusion regarding this tutorial.

As with most electronic devices, as time goes by they evolve and improve their physical and technical characteristics.

In the case of ROM, the same has also happened. Over the years They have evolved by improving their function.


It is one of the pfirst memories that were made. It is known as non-volatile memory, since when the device is turned off, it does not lose the information it contains.

Therefore, this type of memory has the ability to work (Store information) without the need to receive an electrical current.


Is a digital type programmable memory It needs a device called PROM to be able to receive the writing.

use a rom memory

This PROM memory can only be programmed once, because each memory unit requires a small fuse that burns when it is written.


EPROM memory it is erasable read-only and can be programmable. It is basically a PROM memory with the ability to erase information by means of ultraviolet light.

You can also erase information when exposed to very high voltage levels, in such a way that you can erase your information and you can make a replacement.


The EEPROM is a read-only memory that can be erased and can be re-programmed electrically. It is a modification of the EPROM memory that does not need ultraviolet light to erase the contents within.

It can be rescheduled through your own circuit, in such a way that it has access to the bits that have the information individually.

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